Ion-beam-driven electrostatic hydrogen cyclotron waves on auroral field lines

Details Ion-beam-driven electrostatic hydrogen cyclotron waves on auroral field lines Ion-beam-driven electrostatic hydrogen cyclotron waves on auroral field lines

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1023o&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 1023-1026.

Physics

19

Atmospheric Electricity, Auroral Zones, Electrostatic Waves, Hydrogen Ions, Ion Beams, Ion Cyclotron Radiation, Electric Field Strength, Field Aligned Currents, Harmonic Generations, Ionospheric Currents, Ionospheric Electron Density, Magnetohydrodynamic Stability, Power Spectra

Scientific paper

It is shown analytically and by means of plasma numerical simulations that the large amplitude hydrogen cyclotron waves on auroral field lines near 1 earth radius altitude may be excited by upward flowing ion beams rather than by field-aligned currents. The large amplitude electric field near omega of about 0 is identified as the ion gyro-harmonic waves on the beam ions observed in the frame of background ions and, therefore, such a wave exists only when the instability is excited by ion beams. Both the theory and numerical simulations support the conclusion.

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